CN210487070U - Acoustic sensor suitable for strong electromagnetic environment - Google Patents
Acoustic sensor suitable for strong electromagnetic environment Download PDFInfo
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- CN210487070U CN210487070U CN201921774726.5U CN201921774726U CN210487070U CN 210487070 U CN210487070 U CN 210487070U CN 201921774726 U CN201921774726 U CN 201921774726U CN 210487070 U CN210487070 U CN 210487070U
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Abstract
The utility model discloses an acoustic sensor suitable for forceful electric magnetic environment, include: the device comprises a transduction element, a rubber packaging layer, a conductive coating, a rubber packaging layer, a transduction element anode signal wire, a transduction element cathode signal wire, a shielding cable anode signal wire and a shielding cable metal shielding film; the transducer element is completely wrapped by the conductive coating and the metal shielding film of the shielding cable, and the conductive coating and the metal shielding film are grounded, so that the external electromagnetic field is completely shielded, and the transducer can be normally used in a strong electromagnetic field environment. The utility model provides an acoustic sensor, required material kind is few, and is with low costs, and the manufacture process is simple, and corrosion-resistant high temperature resistant and small can soak for a long time in transformer oil and the performance remains stable.
Description
Technical Field
The utility model relates to an acoustics tests technical field, more specifically relates to an acoustic sensor suitable for forceful electric magnetic environment.
Background
The hydrophone is a common acoustic sensor used for sound pressure test in liquid media, and the principle of the hydrophone is that various piezoelectric ceramic materials are mostly adopted as transducer elements, sound pressure fluctuation acting on the transducer elements is converted into electric signals which are acquired by test equipment, and therefore sound pressure measurement in the media is achieved. Hydrophones are generally used for underwater acoustic testing, and related products are common, such as BK8103, 8104 series and the like.
The technology for measuring the internal noise of the oil-immersed transformer by using the hydrophone has great application potential, but the acoustic sensor which can be used for long-term monitoring is rare at present. In view of the above, the utility model discloses a sensor for monitoring noise of oil-immersed transformer (patent No. ZL201710665174.3), which provides a novel sensor for long-term accurate testing in transformer oil. Although the novel sensor can adopt the metal mesh as a shielding layer, the novel sensor has certain anti-electromagnetic interference performance, but still can be influenced in a strong electromagnetic environment, thereby bringing adverse effects on the measurement accuracy.
Therefore, it is urgently needed to design a small-sized acoustic sensor which can be applied to a strong electromagnetic environment so as to accurately measure the internal noise of the oil-immersed transformer.
SUMMERY OF THE UTILITY MODEL
Based on this, the utility model provides an acoustic sensor suitable for forceful electric magnetic environment, this acoustic sensor's totality is small, can corrosion-resistant high temperature resistant, and possesses very strong interference killing feature, the measurement of specially adapted oil-immersed transformer internal noise.
In order to solve the above problem, the utility model provides an acoustic sensor suitable for forceful electric magnetic environment, include: the energy conversion device comprises an energy conversion element, an inner rubber packaging layer, a conductive coating, an outer rubber packaging layer, a shielding cable anode signal wire and a shielding cable metal shielding film; the transduction element and the positive signal wire of the shielding cable are packaged by the inner rubber packaging layer, the conductive coating is arranged on the outer side of the inner rubber packaging layer, and the conductive coating and the outer side of the metal shielding film of the shielding cable are packaged by the outer rubber packaging layer;
the inner rubber packaging layer is arranged between the positive signal wire of the shielded cable and the metal shielding film of the shielded cable; the positive electrode signal wire of the transduction element is connected with the positive electrode signal wire of the shielding cable, and the negative electrode signal wire of the transduction element is connected with the metal shielding film or the conductive coating of the shielding cable; the conductive coating is connected with the metal shielding film of the shielding cable and partially overlapped so as to completely wrap the energy conversion element and the positive signal wire of the shielding cable.
Furthermore, the positive signal wire of the shielding cable is a single-core metal wire.
Further, the transduction element is a PZT-5 series piezoelectric ceramic tube.
Further, the conductive coating and the shielded cable metal shielding film are grounded or connected to a device ground.
Further, the conductive coating and the shielding cable metal shielding film are of a film-shaped structure without any hole.
Further, the conductive coating is 30 mu m TF-801 silver conductive paint, and the resistance of the silver conductive paint is less than or equal to 0.025 ohm/square centimeter.
Further, the inner rubber packaging layer and/or the outer rubber packaging layer are made of polyurethane materials.
Further, the acoustic sensor is placed in oil of the oil-immersed transformer, so that the acoustic pressure signal in the oil is monitored according to the energy conversion element.
The utility model provides an acoustic sensor suitable for strong electromagnetic environment, which realizes the three-dimensional all-around wrapping of a transducer element by an ultra-thin conductive coating arranged outside, so that the transducer element can be ensured to be capable of measuring weak noise while being wrapped by the conductive coating, and the volume of the sensor is not remarkably increased; in addition, the shielding cable with the metal film shielding layer is used, and the conductive coating and the metal shielding film are grounded, so that the external electromagnetic field is completely shielded, and the sensor can be completely normally used in a strong electromagnetic field environment; finally, the utility model provides an acoustic sensor, required material kind is few, and is with low costs, can carry out the cladding preparation layer upon layer from inside to outside and form, and its manufacture process is simple, the utility model discloses an acoustic sensor's totality is small (the diameter of shielding cable can be 3 ~ 5mm, and sensing part volume is the thumb finger size), and the noise measurement is accurate, can be corrosion-resistant high temperature resistant, and possesses very strong anti-electromagnetic interference performance, the measurement of specially adapted oil-immersed transformer internal noise.
Drawings
The features and advantages of the invention will be more clearly understood by reference to the accompanying drawings, which are schematic and should not be understood as imposing any limitation on the invention, in which:
fig. 1 is a cross-sectional view of an acoustic sensor according to an embodiment of the present invention.
Description of reference numerals: the energy conversion device comprises an energy conversion element-1, an inner rubber packaging layer-2, a conductive coating-3, an outer rubber packaging layer-4, an energy conversion element anode signal wire-5, an energy conversion element cathode signal wire-6, a shielding cable anode signal wire-7, a shielding cable metal shielding film-8, a grounding wire-9 and a shielding cable-10.
Detailed Description
The present invention will be described more fully with reference to the accompanying drawings and examples, which are provided for illustration purposes and are not intended to limit the scope of the invention.
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
Fig. 1 is a cross-sectional view of an acoustic sensor suitable for use in a strong electromagnetic environment, the acoustic sensor comprising: the device comprises a transduction element 1, an inner rubber packaging layer 2, a conductive coating 3, an outer rubber packaging layer 4, a transduction element anode signal wire 5, a transduction element cathode signal wire 6, a shielding cable anode signal wire 7, a shielding cable metal shielding film 8, a grounding wire 9 and a shielding cable 10.
As shown in fig. 1, in the acoustic sensor of the present invention, the relationship between the components is as follows: the transduction element 1 and the shielding cable anode signal wire 7 are encapsulated by an inner rubber encapsulation layer 2, so that a closed loop is not formed between the transduction element 1 serving as a piezoelectric ceramic tube and a shielding cable metal shielding film 8 in a shielding cable 10, and the acoustic sensor can normally operate. In addition, the outer side of the inner rubber packaging layer 2 is provided with an ultrathin conductive coating 3, and the outer side of the conductive coating 3 is packaged by an outer rubber packaging layer 4 again, so that the sensing can be insulated, insulated and corrosion-resistant; the shielded cable 10 comprises a shielded cable anode signal wire 7 and a shielded cable metal shielding film 8 (namely, a cathode of the shielded cable), the inner rubber packaging layer 2 is arranged between the shielded cable anode signal wire 7 and the shielded cable metal shielding film 8 for insulation, and the outer side of the shielded cable metal shielding film 8 is packaged by the outer rubber packaging layer 4 again; the positive signal wire 5 of the transduction element 1 is connected with the positive signal wire 7 of the shielded cable, the negative signal wire 6 of the transduction element is connected with the metal shielding film 8 of the shielded cable or the conductive coating 3, and one end of the conductive coating 3 is connected with the metal shielding film 8 of the shielded cable and is partially overlapped; finally, the conductive coating 3 and the shielding cable metal shielding film 8 can completely wrap the transducer element 1 and the shielding cable anode signal wire 7.
Further, in order to realize the sealing performance and strong electromagnetic isolation of the sensor in water, the conductive coating 3 and the shielding cable metal shielding film 8 are of film-shaped structures without any holes, so that the transducer element 1 and the shielding cable anode signal wire 7 can be completely wrapped by the conductive coating and the metal shielding film.
In another embodiment, the positive signal line 7 of the shielded cable may be a single-core metallic copper flexible wire, a rubber insulating layer formed by an inner rubber packaging layer 2 is arranged outside the single-core metallic copper flexible wire, a shielding cable metallic shielding film 8 is arranged outside the rubber insulating layer, the inner rubber packaging layer 2 may form a hollow flexible hollow circular tube structure to hermetically wrap the positive signal line 7 of the shielded cable and the transducer element 1, and the length of the shielding cable 10 extending from the upper part of the sensor in fig. 1 may be extended as needed, and may be butted with other extended shielding cables to be deeply placed in liquid for noise detection.
In another embodiment, the transducer element 1 may be made of a piezoelectric ceramic material, such as a PZT-5 series piezoelectric ceramic tube, which is a commonly used hydrophone transducer element suitable for receiving signals and has the advantages of high sensitivity and good stability. The piezoelectric ceramic tube can be a hollow piezoelectric ceramic tube shaped like a Chinese character 'kou' in fig. 1, and can also be a piezoelectric ceramic material structure in other shapes as long as the piezoelectric ceramic tube can realize noise measurement.
In another embodiment, in order to achieve the electromagnetic shielding effect of the conductive coating 3 and the shielding cable metal shielding film 8, the conductive coating 3 and the shielding cable metal shielding film 8 are grounded or connected to the equipment ground, preferably, as shown in fig. 1, the shielding cable metal shielding film 8 is grounded at a single point through a grounding wire 9, and the grounding wire 9 may be a grounding wire connected to other extension shielding cables.
In addition, after many tests, the conductive coating 3 of the present invention can be preferably 30 μm TF-801 silver conductive paint, the resistance of which is less than or equal to 0.025 ohm/cm (the thickness of the paint film is not less than 20 μm). As shown in fig. 1, the transducer element negative signal line 6 is welded to one end of the shielded cable metal shielding film 8. The positive signal wire 5 of the transducer element is welded with the positive signal wire 7 of the shielded cable. The conductive coating 3 is connected to the metallic shielding film 8 of the shielded cable and entirely encloses the transducer element 1 and the positive signal line 5 of the transducer element 1. Preferably, the paint of the conductive coating can also be polyurethane high-conductivity paint and the like, so that the performances of high temperature resistance and the like are enhanced while the conductivity is ensured.
In another embodiment, the inner rubber sealing layer 2 and the outer rubber sealing layer 4 are used as a wrapping structure of the conductive coating 3 and the metal shielding film 8 of the shielded cable, which has insulation performance, and at the same time, since a small-sized acoustic sensor may be used for noise measurement when being placed in a liquid with certain temperature and corrosion (such as transformer oil), the inner rubber sealing layer 2 and the outer rubber sealing layer 4 may preferably be made of polyurethane (polyurethane) with high temperature resistance and corrosion resistance, and the polyurethane material has good adhesion with the transducer element 1 such as a piezoelectric ceramic tube, and at the same time, has good transformer oil resistance, and can be soaked in the transformer oil for a long time, and the performance can be kept stable. For example, the acoustic sensor may operate in transformer oil at temperatures around 80 ℃ for long periods of time.
Furthermore, the embodiment of the utility model provides an outer rubber packaging layer 4 will transduction component 1, inlayer rubber packaging layer 2, conductive coating 3, the anodal signal line of transduction component 5, transduction component negative pole signal line 6, the anodal signal line 7 of shielded cable and shielded cable metal shielding film 8 all encapsulate to guarantee the stability of sensor work.
Specifically, the working mode and principle of the acoustic sensor of the present invention will be described below to highlight its advantages: when the acoustic sensor of the utility model is used for measuring the acoustic pressure signal in the oil-immersed transformer oil, the small acoustic sensor is placed in the oil-immersed transformer oil, because the vibration of the iron core, the winding and other structures of the oil-immersed transformer can generate noise, further the oil can generate certain sound pressure, because the inner rubber packaging layer 2, the conductive coating 3, the outer rubber packaging layer 4 and the like have certain flexibility and are relatively thin, the energy conversion element 1 can accurately receive a sound pressure signal at the moment, the piezoelectric ceramic tube of the acoustic sensor converts the sound pressure signal into an electric signal for transmission after monitoring the sound pressure, and simultaneously shields the interference of external electromagnetic field through the shielding layer formed by the conductive coating 3 and the metal shielding film 8 of the shielded cable, and the staff can obtain the internal noise signal of the oil-immersed transformer after sensitivity conversion according to the measured electric signal.
It is worth mentioning that the acoustic sensor suitable for strong electromagnetic environment of the utility model has clear levels from inside to outside, reasonable layout, less types and quantity of required materials and low manufacturing cost; secondly, the acoustic sensor can be manufactured by coating layer by layer from inside to outside, and the manufacturing process is simple; furthermore, the utility model discloses an acoustic sensor's totality is small, and sensing portion total volume size is generally big for the thumb finger, and the diameter of its shielding cable can be 3 ~ 5mm to can be so that it is applicable to in stretching into the measuring environment at narrow position in the transformer.
In the description of the embodiments of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the technical solution of the present invention, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: those skilled in the art can still modify or easily conceive of changes in the technical solutions described in the foregoing embodiments or make equivalent substitutions for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. An acoustic sensor adapted for use in a strong electromagnetic environment, comprising: the energy conversion device comprises an energy conversion element, an inner rubber packaging layer, a conductive coating, an outer rubber packaging layer, a shielding cable anode signal wire and a shielding cable metal shielding film; the transduction element and the positive signal wire of the shielding cable are packaged by the inner rubber packaging layer, the conductive coating is arranged on the outer side of the inner rubber packaging layer, and the conductive coating and the outer side of the metal shielding film of the shielding cable are packaged by the outer rubber packaging layer;
the inner rubber packaging layer is arranged between the positive signal wire of the shielded cable and the metal shielding film of the shielded cable; the positive electrode signal wire of the transduction element is connected with the positive electrode signal wire of the shielding cable, and the negative electrode signal wire of the transduction element is connected with the metal shielding film or the conductive coating of the shielding cable; the conductive coating is connected with the metal shielding film of the shielding cable and partially overlapped so as to completely wrap the energy conversion element and the positive signal wire of the shielding cable.
2. The acoustic sensor suitable for a strong electromagnetic environment according to claim 1, wherein the shielded cable positive signal wire is a single-core metallic copper flexible wire.
3. The acoustic sensor adapted for use in a high electromagnetic environment of claim 1, wherein said transducing element is a PZT-5 series piezoelectric ceramic tube.
4. The acoustic sensor adapted for use in a high electromagnetic environment of claim 1, wherein said conductive coating and said shielded cable metal shielding film are grounded or connected to a device ground.
5. The acoustic sensor for strong electromagnetic environment according to claim 1, wherein the conductive coating and the metallic shielding film of the shielded cable are of a film structure without any holes.
6. An acoustic sensor suitable for use in a high electromagnetic environment as claimed in claim 1 or 5, wherein the conductive coating is 30 μm TF-801 silver conductive paint having a resistance of 0.025 ohm/cm or less.
7. The acoustic sensor for strong electromagnetic environment according to claim 1, wherein the inner rubber encapsulation layer and/or the outer rubber encapsulation layer is made of polyurethane.
8. The acoustic sensor for use in high electromagnetic environments of claim 1, wherein the acoustic sensor is placed in oil in an oil-filled transformer to monitor an acoustic pressure signal in the oil from the transducing element.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921774726.5U CN210487070U (en) | 2019-10-22 | 2019-10-22 | Acoustic sensor suitable for strong electromagnetic environment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921774726.5U CN210487070U (en) | 2019-10-22 | 2019-10-22 | Acoustic sensor suitable for strong electromagnetic environment |
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| CN210487070U true CN210487070U (en) | 2020-05-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579270A (en) * | 2019-10-22 | 2019-12-17 | 国网湖南省电力有限公司 | Acoustic sensor suitable for strong electromagnetic environment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110579270A (en) * | 2019-10-22 | 2019-12-17 | 国网湖南省电力有限公司 | Acoustic sensor suitable for strong electromagnetic environment |
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